The ballot measure was sought by backers of a proposed casino in Wood Village that would be the first in Oregon that is not operated by a tribe. The proposal also requires that commercial casinos turn over 25 percent of their gaming revenues to the state.

The state Elections Division said the constitutional measure had 116,521 valid signatures, just over the 116,284 required to qualify initiatives seeking to amend the constitution.

The division said the constitutional measure had a signature validity rate of 55.35 percent.

In 2010, the supporters of a Wood Village casino failed to gather enough signatures to get the proposed constitutional amendment on the ballot. Instead, they proceeded with just one measure, to site the casino in Wood Village, and that was strongly defeated at the polls.

The chief petitioners, Bruce Studer and Matthew Rossman of Lake Oswego, have indicated they planned a more extensive campaign this year and expressed confidence they can qualify both measures.

The Elections Division says the two had 74,030 valid signatures following an early turn-in on May 25 of 125,115 signatures. They submitted 32,744 signatures on July 6 and only need fewer than half of them to be valid to obtain the 87,213 needed.